9. shot (n.) a consecutive series of pictures that constitutes a unit of action in a film
The vacuum level is determined by the pressure differential between the evacuated volume and the surrounding atmosphere. Several units of measure can be used. Most refer to the height of a column of mercury â usually inches of mercury (in.-Hg) or millimeters of mercury (mm-Hg).
The reading is the pressure above the absolute zero of pressure (or perfect vacuum). The vacuum in the vacuum bag or resin trap is measured with a vacuum gauge and the reading is relative to the external atmospheric pressure, in units on the barometric scale or as a percentage of atmospheric pressure.